Please accept our sincere apologies for having taken so long to reach your post. I realize you’ve been waiting for an unacceptable period of time, and while no doubt your patience has worn thin, rest assured we’ll be attentively watching this post from here on out to assure a resolution.
The diagnostics you’ve provided usually indicate that an internet service provider modem/router in your network setup is not properly enabled in Bridge mode.
I first recommend scanning through the list of known solutions we’re curating here, with particular attention to threads similar to your own issue:
If the above threads don’t provide useful guidance or prove irrelevant to your situation, please take the following troubleshooting steps:
- Try to enable UPnP/NATPMP in the web administration interface for the router directly upstream from your Core
- Try to manually open the port in your router’s port forwarding configuration
- Make sure the IP/Port matches the Port listed in Roon → Settings → ARC (it seems you’ve already done this)
- Check for any VPNs or Firewalls throughout your local network that might be interfering
If you continue to experience difficulties, please respond here and include the following information:
- What is the make and model of your modem and router?
- Do you have any additional network hardware, like additional routers or managed switches?
- Who is your internet service provider and what is your geographic region?
- Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?
Thank you again, @William_Mcloughlin, and we’ll be watching for your response.